Me and Johnny went searching around the Caribbean for this list of items, and had an amazing time at that.
Here's our screens...
Spoiler for Scavenger Hunt finds:

Warlord

Pose on Outcast (sorry, didn't think about not using f12)

Hunter find and sink

Top of Kingshead

Found ya Del

Thought bubble on Abassa Tortuga

Nill O'frill

Joshamee Gibbs

Matching Outfit

Lv 50 Thrall

Cassandra

Battle Royale, first to attack, and sank it. :P

Captain Barbossa

Boarding the Man-O-War
I counted a total of 56 points.
lol, we FOUND a Nathaniel Grimm Navy boss on Kingshead, but someone killed it before I could screen. xD
(and both people were supposed to be in the screen, yes.)